Coal bed gas compressor control system, control method and coal bed gas dedusting and pressurizing system
By introducing sensors and control modules into the coalbed methane compressor system, automated control and fault alarms are achieved, solving the problem of unstable compressor operation in existing technologies and ensuring safe and efficient pressurization and dust removal and dehydration of coalbed methane.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- SHANXI LANYAN COALBED METHANE GRP CO LTD
- Filing Date
- 2026-01-09
- Publication Date
- 2026-04-17
AI Technical Summary
The existing coalbed methane pressurization process is imperfect, the compressor load control is inaccurate, the electric valve opens slowly and cannot be stopped quickly, the control system cannot automatically adjust the flow rate according to the upstream discharge pressure and the downstream pipeline pressure, cannot control the flow rate when the intake pressure is too high, cannot provide early warning of sewage pipe blockage, and cannot automatically adjust the compressor cooling system temperature, resulting in unstable compressor operation and substandard gas quality.
A coalbed methane compressor control system is adopted, including a compressor, an inlet pipeline and an outlet pipeline connected in series, a bypass electric ball valve, a return pipeline and a sensor connected in parallel, and a vertical oil removal filter is installed. The system realizes automatic control and fault alarm through sensors and control modules to ensure the safe and efficient operation of the compressor.
It achieves safe, efficient, and stable operation of the compressor, promptly detects and alarms faults, ensures that the quality meets standards, and solves the problems of high compressor failure rate and unstable operation of the dust removal, compression, and dehydration system.
Smart Images
Figure CN121875944A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to a coalbed methane compressor control system, control method, and coalbed methane dust removal and pressurization system, belonging to the field of coalbed methane treatment technology. Background Technology
[0002] With the large-scale development and utilization of coalbed methane (CBM), it is increasingly being co-transported and used with natural gas. Pipeline transportation is the primary method for exporting and utilizing CBM. Compared to natural gas, CBM has relatively lower gathering and transmission pressures, typically ranging from 0.05 MPa to 0.3 MPa, and contains higher dust content. Long-distance pipelines generally operate at pressures between 4.0 MPa and 6.3 MPa, usually requiring dust removal, pressurization, and dehydration before export.
[0003] Due to its extraction characteristics, coalbed methane has a high dust content, containing not only dust from the coal seam but also impurities from fracturing, pipeline corrosion, and other sources. However, inadequate filtration systems frequently lead to clogged compressor valves, shortened maintenance cycles, and in severe cases, piston and cylinder wear. Because of the high pressure, oil-lubricated piston compressors are generally used, but the discharged gas carries a small amount of lubricating oil, which can cause malfunctions in downstream dehydration equipment and substandard gas quality.
[0004] The existing coalbed methane pressurization process is incomplete, with imprecise compressor load control. Loading and unloading are controlled by electric valves, which open slowly during shutdown, especially in emergency shutdowns. Furthermore, the electric valves lack bypass valves, requiring manual switching for operation in case of electric actuator failure, resulting in poor safety. Additionally, the control system cannot automatically adjust flow based on upstream coalbed methane drainage pressure and downstream pipeline pressure, cannot control flow when starting due to excessively high inlet pressure, cannot provide early warning of blockages in the drainage pipeline, and cannot automatically regulate the compressor cooling system temperature. Summary of the Invention
[0005] In view of the shortcomings of the prior art, the purpose of this invention is to provide a coalbed methane compressor control system, control method and coalbed methane dust removal and pressurization system, which improves the monitoring and control of the compressor unit, can detect the unit's operation faults in a timely manner, ensure the safe, efficient and stable operation of the compressor unit, and also ensure the stable operation of the coalbed methane dust removal, pressurization and dehydration system and the quality of the gas.
[0006] To achieve the above objectives, the present invention adopts the following technical solution: a coalbed methane compressor control system, comprising a compressor, wherein the compressor comprises a primary compression unit, a secondary compression unit and a vertical oil removal filter connected in series. An electro-pneumatic ball valve and an intake pressure sensor are sequentially installed on the intake pipe of the compressor. A bypass electric ball valve is connected in parallel at the electro-pneumatic ball valve. An exhaust pressure sensor is installed on the outlet pipe of the compressor. The compressor’s intake pipe and outlet pipe are connected by a return pipe, and a return regulating valve, a return switching valve and a return manual valve as an emergency valve are connected in parallel on the return pipe. The primary compression unit includes a primary intake scrubbing tank, a primary compression device, and a primary cooler connected in series; the secondary compression unit includes a secondary intake scrubbing tank, a secondary compression device, and a secondary cooler connected in series. A low-pressure drain pressure sensor is installed on the drain line of the primary intake washing tank, and a high-pressure drain pressure sensor is installed on the drain line of the secondary intake washing tank. The lubrication systems of both the primary and secondary compression devices are connected to the high-level oil tank. The high-level oil tank is equipped with a high-level oil tank level sensor, which is connected to the oil pump. The wastewater discharge from both the primary and secondary compression devices is connected to the wastewater collection tank. The circulating water inlet pipe of the first-stage cooler is equipped with a first inlet pneumatic regulating valve, and the coalbed methane outlet pipe of the first-stage cooler is equipped with a first coalbed methane temperature sensor. The circulating water inlet pipe of the second-stage cooler is equipped with a second inlet pneumatic regulating valve, and the coalbed methane outlet pipe of the second-stage cooler is equipped with a second coalbed methane temperature sensor. The intake pressure sensor, exhaust pressure sensor, low-pressure sewage pressure sensor, high-pressure sewage pressure sensor, high-level oil tank level sensor, first coalbed methane temperature sensor, second coalbed methane temperature sensor, electro-pneumatic switch ball valve, bypass electric ball valve, reflux regulating valve, reflux switch valve, first water inlet pneumatic regulating valve, and second water inlet pneumatic regulating valve are all electrically connected to the control module, and an alarm module is also connected to the control module.
[0007] Preferably, the vertical oil removal filter is a vertical structure with upper and lower separation and low inlet and high outlet, and a first liquid level sensor and a first automatic drain valve are provided in the lower first separation structure, and a second liquid level sensor and a second automatic drain valve are provided in the upper second separation structure. The first liquid level sensor, the second liquid level sensor, the first automatic drain valve, and the second automatic drain valve are all electrically connected to the control module.
[0008] Preferably, an intake filter is also provided on the intake pipe of the compressor. The intake filter is connected in series before the electro-pneumatic switch ball valve, and the differential pressure sensor is installed at both ends of the intake filter. The differential pressure sensor is electrically connected to the control module.
[0009] The coalbed methane compressor control method based on the above-mentioned coalbed methane compressor control system includes: The intake pressure of the compressor is detected by an intake pressure sensor. With the electro-pneumatic switch ball valve closed, the bypass electric ball valve is controlled to control the intake pressure, ensuring that the intake pressure is within the design operating range of the compressor unit. The compressor's start-up, loading, unloading, and shutdown are controlled by a reflux regulating valve, a reflux switch valve, and a reflux manual valve. During startup, both the reflux regulating valve and the reflux switch valve are open. During loading, the reflux switch valve closes rapidly, while the reflux regulating valve closes slowly based on the intake and exhaust pressures, ensuring a smooth loading process. Upon receiving a shutdown command, both the reflux regulating valve and the reflux switch valve open rapidly, quickly putting the unit into unloading mode. The reflux manual valve serves as an emergency valve, normally kept closed. In case of an emergency or during maintenance of the reflux regulating valve, the reflux manual valve is manually operated to start or stop the compressor. The discharge pressure of compressor 3 is detected by the discharge pressure sensor, and the load level of the compressor is adjusted to ensure that the discharge pressure matches the pressure of the downstream user. Low-pressure and high-pressure sewage discharge pressure sensors are used to detect the pressure of their respective sewage discharge pipelines. When the sewage discharge pipeline is clogged or pressure is trapped, a high pressure alarm or a very high alarm is triggered. The high-level oil tank is used to replenish the lubrication system in the first-stage and second-stage compression units. The oil pump is used to replenish the high-level oil tank. The high-level oil tank level sensor is used to detect the drop in the oil level in the high-level oil tank. The control module records the amount of lubricating oil consumed. The wastewater collection tank is manually emptied periodically, and the amount of lubricating oil consumed during wastewater discharge in the primary and secondary compression units is recorded. Based on the coalbed methane temperature detected by the first coalbed methane temperature sensor and the second coalbed methane temperature sensor, the cooling water circulation volume of the corresponding cooler is adjusted through the first water inlet pneumatic regulating valve and the second water inlet pneumatic regulating valve.
[0010] Preferably, the coalbed methane compressor control method further includes: In the vertical oil removal filter, the control module controls the first automatic drain valve and the second automatic drain valve to automatically drain the oil based on the liquid level detected by the first liquid level sensor and the second liquid level sensor in the corresponding separation structure.
[0011] Preferably, the coalbed methane compressor control method further includes: The differential pressure sensor detects the pressure difference before and after the intake filter. When the control module determines that the pressure difference has increased to the set value, it issues an alarm signal.
[0012] A coalbed methane dust removal and pressurization system includes a first-stage filter, a first-second-stage filter, a compressor, an oil removal filter, a triethylene glycol dehydration device, and a metering and pressure regulating device connected in series. The compressor is equipped with the aforementioned control system; The inlet end of the first-stage filter is connected to the inlet pipeline, and the outlet end of the metering and pressure regulating device is connected to the outlet pipeline.
[0013] Preferably, the coalbed methane dust removal and pressurization system further includes a second primary filter and a second secondary filter. The second primary filter is connected in parallel with the first primary filter, and both have a filtration accuracy of 5μm, with one filter in use and the other on standby. The second secondary filter is connected in parallel with the first secondary filter, and both have a filtration accuracy of 1μm, with one filter in use and the other on standby.
[0014] Preferably, the filtration accuracy of the first primary filter and the second primary filter is 5 μm, and the filtration accuracy of the first secondary filter and the second secondary filter is 1 μm.
[0015] Compared with the prior art, the present invention has the following beneficial effects.
[0016] 1. This invention adds a bypass electric ball valve to adjust the intake pressure during startup; a return regulating valve, a return switching valve, and a return manual valve are connected in parallel on the return pipeline to safely and efficiently complete the compressor's startup, loading, unloading, and shutdown operations; in addition, it adds intake and exhaust pressure detection, drain pressure detection, automatic oil replenishment of the high-level oil tank, and automatic control of cooling water volume, improving the compressor's control system and control methods, enabling timely detection of compressor unit malfunctions and issuing alarms, ensuring the compressor unit can operate safely, efficiently, and stably.
[0017] 2. In this invention, a vertical oil removal filter is installed after the two compression units of the compressor to remove the lubricating oil carried in the coalbed methane, ensuring the safe operation of downstream equipment and the compliance of the gas quality standards.
[0018] In summary, this invention solves the problems of high compressor failure rate and unstable operation of the overall dust removal, compression and dehydration system caused by the high amount of impurities in coalbed methane. Attached Figure Description
[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the embodiments will be briefly introduced below.
[0020] Figure 1 This is a schematic diagram of the structure of the coalbed methane compressor control system in this invention.
[0021] Figure 2 This is a schematic diagram of the coalbed methane dust removal and pressurization system in this invention.
[0022] In the diagram: 101 is the first-stage filter, and 102 is the second-stage filter; 201 is the first and second stage filter, and 202 is the second and second stage filter; 3 is the compressor; 301 is the primary compression unit; 302 is the secondary compression unit; 303 is the vertical oil filter; 304 is the intake filter; 305 is the differential pressure sensor; 306 is the electro-pneumatic ball valve; 307 is the bypass electric ball valve; 308 is the intake pressure sensor; 309 is the exhaust pressure sensor; 310 is the reflux regulating valve; 311 is the reflux switching valve; 312 is the reflux manual valve; 313 is the primary intake scrubber; 314 is the primary compression unit; 315 is the primary cooler; 316 is the secondary intake scrubber; 317 is the secondary... The compression unit includes: 318 a secondary cooler; 319 a high-level oil tank; 320 a high-level oil tank level sensor; 321 an oil pump; 322 a sludge collection tank; 323 a low-pressure sludge discharge pressure sensor; 324 a high-pressure sludge discharge pressure sensor; 325 a first inlet pneumatic regulating valve; 326 a first coalbed methane temperature sensor; 327 a second inlet pneumatic regulating valve; 328 a second coalbed methane temperature sensor; 329 a first level sensor; 330 a first automatic sludge discharge valve; 331 a second level sensor; and 332 a second automatic sludge discharge valve. 4 is an oil removal filter, 5 is a triethylene glycol dehydration device, and 6 is a metering and pressure regulating device. Detailed Implementation
[0023] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0024] The present invention provides the following embodiments.
[0025] like Figure 1 As shown, the present invention provides a coalbed methane compressor control system, including a compressor 3, wherein the compressor 3 includes a primary compression unit 301, a secondary compression unit 302 and a vertical oil removal filter 303 connected in series. The compressor 3 is provided with an electro-pneumatic switch ball valve 306 and an intake pressure sensor 308 in sequence on the intake pipe. A bypass electric ball valve 307 is connected in parallel at the electro-pneumatic switch ball valve 306. The compressor 3 is provided with an exhaust pressure sensor 309 on the exhaust pipe. The intake pipe is connected to the first-stage compression unit 301, and the exhaust pipe is connected to the vertical oil removal filter 303. The compressor 3's intake pipe and outlet pipe are connected by a return pipe, and a return regulating valve 310, a return switching valve 311, and a return manual valve 312 as an emergency valve are connected in parallel on the return pipe. The primary compression unit 301 includes a primary intake scrubbing tank 313, a primary compression device 314 and a primary cooler 315 connected in series. The secondary compression unit 302 includes a secondary intake scrubbing tank 316, a secondary compression device 317 and a secondary cooler 318 connected in series. A low-pressure drain pressure sensor 323 is installed on the drain line of the primary air intake washing tank 313, and a high-pressure drain pressure sensor 324 is installed on the drain line of the secondary air intake washing tank 316. The lubrication systems of the primary compression unit 314 and the secondary compression unit 317 are both connected to the high-level oil tank 319. The high-level oil tank 319 is equipped with a high-level oil tank level sensor 320, which is connected to the oil pump 321. The high-level oil tank 319 is used to replenish the lubrication systems in the primary compression unit 314 and the secondary compression unit 317, and the oil pump 321 is used to replenish the high-level oil tank 319. The sewage discharge of both the primary compression device 314 and the secondary compression device 317 is connected to the sewage collection tank 322. The circulating water inlet pipe of the first-stage cooler 315 is equipped with a first inlet pneumatic regulating valve 325, and the coalbed methane outlet pipe of the first-stage cooler 315 is equipped with a first coalbed methane temperature sensor 326. The circulating water inlet pipe of the second-stage cooler 318 is equipped with a second inlet pneumatic regulating valve 327, and the coalbed methane outlet pipe of the second-stage cooler 318 is equipped with a second coalbed methane temperature sensor 328. The intake pressure sensor 308, exhaust pressure sensor 309, low-pressure drain pressure sensor 323, high-pressure drain pressure sensor 324, high-level oil tank level sensor 320, first coalbed methane temperature sensor 326, second coalbed methane temperature sensor 328, electro-pneumatic ball valve 306, bypass electric ball valve 307, reflux regulating valve 310, reflux switching valve 311, first water inlet pneumatic regulating valve 325, and second water inlet pneumatic regulating valve 327 are all electrically connected to the control module, which also has an alarm module connected to it. The oil pump 321 is also electrically connected to the control module.
[0026] The vertical oil filter 303 is a vertical structure with two-stage separation and low inlet and high outlet. The first stage separation structure in the lower part is equipped with a first liquid level sensor 329 and a first automatic drain valve 330, and the second stage separation structure in the upper part is equipped with a second liquid level sensor 331 and a second automatic drain valve 332. The first liquid level sensor 329, the second liquid level sensor 331, the first automatic drain valve 330, and the second automatic drain valve 332 are all electrically connected to the control module.
[0027] The vertical oil removal filter 303 is used to separate high-density liquid impurities such as lubricating oil from compressed coalbed methane.
[0028] An intake filter 304 is also provided on the intake pipe of the compressor 3. The intake filter 304 is connected in series before the electro-pneumatic switch ball valve 306, and the differential pressure sensor 305 is installed at both ends of the intake filter 304. The differential pressure sensor 305 is electrically connected to the control module. The differential pressure sensor 305 is used to detect whether the intake filter 304 is dirty or clogged. When the clog is severe or the differential pressure is too large, an alarm is triggered and the filter element is replaced manually.
[0029] In this invention, each sensor transmits detection information to the control module, which then controls the automatic opening and closing of each valve, thereby achieving automated control and fault alarm for the compressor.
[0030] The coalbed methane compressor control method based on the above control system includes: The intake pressure of compressor 3 is detected by intake pressure sensor 308. Bypass electric ball valve 307 is a small-orifice ball valve, which can achieve flow control through quick switching. When the electro-pneumatic switch ball valve 306 is closed, the opening and closing of bypass electric ball valve 307 is controlled to control the intake pressure, ensuring that the intake pressure is within the design operating range of compressor 3. The control of bypass electric ball valve 307 is set to manual mode. During control, it can be selected to be automatically controlled by the control module or manually controlled. The compressor 3 is controlled by a reflux regulating valve 310, a reflux switch valve 311, and a reflux manual valve 312 for starting, loading, unloading, and stopping. During startup, both the reflux regulating valve 310 and the reflux switch valve 311 are open. During loading, the reflux switch valve 311 closes quickly, while the reflux regulating valve 310 closes slowly according to the intake and exhaust pressures, allowing the unit to smoothly complete loading. Upon receiving a shutdown command, both the reflux regulating valve 310 and the reflux switch valve 311 open rapidly, allowing the unit to quickly enter the unloading state. The reflux manual valve 312 serves as an emergency valve, normally remaining closed. In case of an emergency or during maintenance of the reflux regulating valve 310, the reflux manual valve 312 is manually operated to start or stop the compressor. The discharge pressure sensor 309 is used to detect the discharge pressure of compressor 3, and the load level of compressor 3 is adjusted to ensure that the discharge pressure matches the downstream user pressure. The low-pressure sewage discharge pressure sensor 323 and the high-pressure sewage discharge pressure sensor 324 are used to detect the pressure of their respective sewage discharge pipelines. When the sewage discharge pipeline is blocked or pressure is accumulated, high pressure alarm and high-high alarm are issued to protect the safe operation of the compressor 3 sewage discharge system. The high-level oil tank 319 is used to replenish the lubrication system in the first-stage compression unit 314 and the second-stage compression unit 317. The oil pump 321 is used to replenish the high-level oil tank 319. The high-level oil tank level sensor 320 is used to detect the drop in the liquid level in the high-level oil tank 319. The control module records the amount of lubricating oil consumed. The sludge collection tank 322 is manually emptied periodically, and the amount of lubricating oil consumed in the sludge discharge of the primary compression unit 314 and the secondary compression unit 317 is recorded. Based on the coalbed methane temperature detected by the first coalbed methane temperature sensor 326 and the second coalbed methane temperature sensor 328, the cooling water circulation volume of the corresponding cooler is adjusted through the first inlet pneumatic regulating valve 325 and the second inlet pneumatic regulating valve 327. When the compressor 3 is started, both the first inlet pneumatic regulating valve 325 and the second inlet pneumatic regulating valve 327 are at fixed opening values. After startup, the valves are put into automatic control to precisely control the temperature of the compressor cooling system and ensure the cooling effect of the unit.
[0031] The coalbed methane compressor control method also includes: In the vertical oil removal filter 303, the first automatic drain valve 330 and the second automatic drain valve 332 are controlled by the control module to automatically drain the oil based on the liquid level detected by the first liquid level sensor 329 and the second liquid level sensor 331 in the corresponding separation structure.
[0032] Specifically, the range of the first liquid level sensor 329 and the second liquid level sensor 331 can be 0-400mm. When the liquid level reaches 300mm, the corresponding drain valve is automatically opened, and when the liquid level drops to 150mm, the corresponding drain valve is closed. This not only achieves automatic drainage, but also avoids the safety risks caused by gas discharge after the liquid level drops to 0mm.
[0033] The coalbed methane compressor control method also includes: The differential pressure sensor 305 detects the pressure difference before and after the intake filter 304. When the control module determines that the pressure difference has increased to the set value, it issues an alarm signal.
[0034] like Figure 2 As shown, the present invention provides a coalbed methane dust removal, pressurization and dehydration system, comprising a first primary filter 101, a first secondary filter 201, a compressor 3, an oil removal filter 4, a triethylene glycol dehydration device 5 and a metering and pressure regulating device 6 connected in series. The compressor 3 is equipped with the aforementioned control system; The inlet end of the first-stage filter 101 is connected to the inlet pipeline, and the outlet end of the metering and pressure regulating device 6 is connected to the outlet pipeline.
[0035] A coalbed methane dust removal, pressurization, and dehydration system further includes a second primary filter 102 and a second secondary filter 202. The second primary filter 102 and the first primary filter 101 are connected in parallel, and both have a filtration accuracy of 5μm, with one filter in use and the other on standby. The second secondary filter 202 and the first secondary filter 201 are connected in parallel, and both have a filtration accuracy of 1μm, with one filter in use and the other on standby.
[0036] The filtration accuracy of the first primary filter 101 and the second primary filter 102 is 5μm, and the filtration accuracy of the first secondary filter 201 and the second secondary filter 202 is 1μm.
[0037] This invention improves the control system and method of compressor 3, enabling timely detection of malfunctions in compressor 3 and issuing alarms, ensuring safe, efficient, and stable operation of compressor 3. Vertical oil filters 303 are installed after the two compression units of compressor 3 to remove lubricating oil carried in the coalbed methane, ensuring the safe operation of downstream equipment and compliance with gas quality standards. This invention solves the problems of high compressor failure rates and unstable operation of the overall dust removal, compression, and dehydration system caused by high levels of impurities in coalbed methane.
[0038] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.
Claims
1. A coalbed methane compressor control system, characterized in that, The compressor (3) includes a primary compression unit (301), a secondary compression unit (302) and a vertical oil removal filter (303) connected in series. The compressor (3) is provided with an electro-pneumatic switch ball valve (306) and an intake pressure sensor (308) in sequence on the intake pipe. A bypass electric ball valve (307) is connected in parallel at the electro-pneumatic switch ball valve (306). An exhaust pressure sensor (309) is provided on the exhaust pipe of the compressor (3). The compressor (3) is connected to the air inlet pipe and the air outlet pipe through a return pipe. A return regulating valve (310), a return switch valve (311), and a return manual valve (312) as an emergency valve are connected in parallel on the return pipe. The primary compression unit (301) includes a primary intake scrubbing tank (313), a primary compression device (314) and a primary cooler (315) connected in series. The secondary compression unit (302) includes a secondary intake scrubbing tank (316), a secondary compression device (317) and a secondary cooler (318) connected in series. A low-pressure drain pressure sensor (323) is installed on the drain line of the primary air intake scrubbing tank (313), and a high-pressure drain pressure sensor (324) is installed on the drain line of the secondary air intake scrubbing tank (316). The lubrication systems of the primary compression device (314) and the secondary compression device (317) are both connected to the high-level oil tank (319). The high-level oil tank (319) is equipped with a high-level oil tank level sensor (320) and is connected to the oil pump (321). The sewage discharge of the primary compression device (314) and the secondary compression device (317) is connected to the sewage collection tank (322); The first-stage cooler (315) is equipped with a first inlet pneumatic regulating valve (325) on the circulating water inlet pipe, and a first coalbed methane temperature sensor (326) is equipped on the coalbed methane outlet pipe of the first-stage cooler (315). The second-stage cooler (318) is equipped with a second inlet pneumatic regulating valve (327) on the circulating water inlet pipe, and a second coalbed methane temperature sensor (328) is equipped on the coalbed methane outlet pipe of the second-stage cooler (318). The intake pressure sensor (308), exhaust pressure sensor (309), low-pressure sewage discharge pressure sensor (323), high-pressure sewage discharge pressure sensor (324), high-level oil tank level sensor (320), first coalbed methane temperature sensor (326), second coalbed methane temperature sensor (328), electro-pneumatic switch ball valve (306), bypass electric ball valve (307), reflux regulating valve (310), reflux switch valve (311), first water inlet pneumatic regulating valve (325), and second water inlet pneumatic regulating valve (327) are all electrically connected to the control module, and an alarm module is also connected to the control module.
2. The coalbed methane compressor control system according to claim 1, characterized in that: The vertical oil removal filter (303) is a vertical structure with two-stage separation and low inlet and high outlet. A first liquid level sensor (329) and a first automatic drain valve (330) are installed in the first-stage separation structure at the bottom, and a second liquid level sensor (331) and a second automatic drain valve (332) are installed in the second-stage separation structure at the top. The first liquid level sensor (329), the second liquid level sensor (331), the first automatic drain valve (330), and the second automatic drain valve (332) are all electrically connected to the control module.
3. The coalbed methane compressor control system according to claim 2, characterized in that: An intake filter (304) is also provided on the intake pipe of the compressor (3). The intake filter (304) is connected in series before the electro-pneumatic switch ball valve (306), and the differential pressure sensor (305) is installed at both ends of the intake filter (304). The differential pressure sensor (305) is electrically connected to the control module.
4. A coalbed methane compressor control method based on the coalbed methane compressor control system of claim 3, characterized in that... include: The intake pressure of the compressor (3) is detected by the intake pressure sensor (308). When the electric pneumatic switch ball valve (306) is closed, the control module controls the intake pressure by controlling the opening and closing of the bypass electric ball valve (307) to ensure that the intake pressure is within the design operating range of the compressor (3) unit. The compressor (3) is controlled by a reflux regulating valve (310), a reflux switch valve (311), and a reflux manual valve (312) for starting, loading, unloading, and stopping: During startup, both the reflux regulating valve (310) and the reflux switch valve (311) are open; during loading, the reflux switch valve (311) closes quickly, and the reflux regulating valve (310) closes slowly according to the intake and exhaust pressures, so that the unit can complete the loading smoothly; when a shutdown command is received, the reflux regulating valve (310) and the reflux switch valve (311) open quickly, so that the unit can quickly enter the unloading state; the reflux manual valve (312) is an emergency valve, which is normally kept closed. When an emergency occurs or the reflux regulating valve (310) is being repaired, the reflux manual valve (312) is manually operated to start and stop the compressor. The discharge pressure of the compressor (3) is detected by the discharge pressure sensor (309), and the loading degree of the compressor (3) is adjusted to ensure that the discharge pressure matches the downstream user pressure. The pressure of each sewage pipeline is detected by a low-pressure sewage pressure sensor (323) and a high-pressure sewage pressure sensor (324). When the sewage pipeline is blocked or pressure is trapped, a high pressure alarm and a high-high alarm are triggered. The lubrication system in the first-stage compression unit (314) and the second-stage compression unit (317) is replenished with oil using the high-level oil tank (319), the high-level oil tank (319) is replenished with oil using the oil pump (321), the high-level oil tank level sensor (320) is used to detect the drop in the liquid level in the high-level oil tank (319), and the lubricating oil consumption is recorded by the control module. The wastewater collection tank (322) is manually drained periodically, and the amount of lubricating oil consumed by the primary compression unit (314) and the secondary compression unit (317) during the wastewater discharge is recorded. Based on the coalbed methane temperature detected by the first coalbed methane temperature sensor (326) and the second coalbed methane temperature sensor (328), the cooling water circulation volume of the corresponding cooler is adjusted by the first water inlet pneumatic regulating valve (325) and the second water inlet pneumatic regulating valve (327).
5. The coalbed methane compressor control method according to claim 4, characterized in that... Also includes: In the vertical oil removal filter (303), the first automatic drain valve (330) and the second automatic drain valve (332) are controlled by the control module to automatically drain the oil based on the detection of the liquid level in the corresponding separation structure by the first liquid level sensor (329) and the second liquid level sensor (331).
6. The coalbed methane compressor control method according to claim 4, characterized in that... Also includes: The differential pressure sensor (305) detects the pressure difference before and after the intake filter (304). When the control module determines that the pressure difference has increased to the set value, it issues an alarm signal.
7. A coalbed methane dust removal and pressurization system, characterized in that: It includes a first-stage filter (101), a first-second-stage filter (201), a compressor (3), an oil removal filter (4), a triethylene glycol dehydration device (5), and a metering and pressure regulating device (6) connected in series. The compressor (3) is equipped with the coalbed methane compressor control system as described in claim 1; The inlet end of the first stage filter (101) is connected to the inlet pipeline, and the outlet end of the metering and pressure regulating device (6) is connected to the outlet pipeline.
8. The coalbed methane dust removal and pressurization system according to claim 7, characterized in that: It also includes a second primary filter (102) and a second secondary filter (202). The second primary filter (102) and the first primary filter (101) are connected in parallel, and both have a filtration accuracy of 5μm, with one in use and one on standby. The second secondary filter (202) and the first secondary filter (201) are connected in parallel, and both have a filtration accuracy of 1μm, with one in use and one on standby.
9. A coalbed methane dust removal and pressurization system according to claim 8, characterized in that: The filtration accuracy of the first primary filter (101) and the second primary filter (102) is 5μm, and the filtration accuracy of the first secondary filter (201) and the second secondary filter (202) is 1μm.